The Periodic Table (CIE Topic 8)

The Periodic Table is arranged in

atomic number order and grouped by similar properties

Reactivity trend of G1

Increases down the group

Melting point trend down G1

Decreases

Density trend down G1

Generally increases

G1 metal + water —>

Metal hydroxide + hydrogen

State of chlorine

Gas

State of bromine

liquid

State of iodine

solid

Colour of chlorine

pale yellow/green

Colour of bromine

red-brown

Colour of iodine

black

Colour of chlorine in solution

virtually colourless

Colour of bromine in solution

orange

Colour of iodine in solution

orange/brown depending on concentration

Colour of iodine vapour

purple

Transition metal properties

High melting point, high densities, coloured compounds/solutions, variable oxidation states, act as catalysts